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CDPS EXCEEDANCE REPORT <br />Mine Site: COLOWYO MINE Permit No.: CO-00045161 <br />Outfall No.: 007A Sample Date: 07/22/2004 <br />Sample Taken by: Summer Intern -Scott Benson Laboratory Sample ID: L46870-01 <br />Exceedences: Total Suspended Solids - 114 mg/L: Settleable Solids - 3 mL/L/h <br />Report Prepared by: Kurtis Blunt <br />Explanation: <br />Precipitation records indicate that there were storm events from July 14 to July 17 and no <br />storms from July 18 to July 21. The sample was taken on July 22. Historical information from <br />similar events followed by several days of no precipitation indicate there has not been any water <br />quality exceedences. Therefore, these exceedences do not make sense when compared to other <br />similar conditions. <br />A newly trained individual took the samples in question. It is suspected that the individual <br />cleaned the perforated riser (weep holes) immediately prior to taking the samples. This activity <br />would assuredly stir up material in front of the weep holes and be incorporated into the sample, <br />causing the abnormal results. Due to the short duration of the discharge at Outfall 007A, <br />supplemental samples were unable to be taken that would support our contention. We believe <br />that the individual inadvertently introduced sediment into the stream flow that contaminated the <br />samples in question, causing elevated levels of Total Suspended Solids and Settleable Solids. <br />Identify Support Info: <br />Colowyo Mine -Ambient Air Network: 3'rd Qtr. Precipitation & Temperature Data <br />Proposed Action: <br />Summer Interns will no longer collect compliance samples without experienced Colowyo <br />employees in attendance. New or temporary employees will complete a formalized training <br />program before they are allowed to collect compliance samples. <br />Approval by Sr. Env. Eng.: Date: 6 .2~ D <br />N:\CCC HSEQ\15-22.0 ST & Cnty\21.0 WQCD@l.l CDPS Permit\21.1.2 Inspections & Reports\2004\CDPS Exceedance <br />Report_007A.doc <br />10/22/2004 <br />